Shimano Dura-Ace Di2 Battery

Works great does the job.

A perfect replacement for my original battery. Easy to install and back in business. 5 stars.

For anyone concerned about older batteries' max charge retention or the snug fit for riding in rainy weather.Does great on all counts.

Ordered and received this battery. However when I attempted to charge the battery it would not take a charge. Contacted seller was able to return battery and requested that they also pay return shipping which they did. Product was defective but seller handled return and refund in a cooperative and helpful manner with good communication each time I Emailed them. I’m disappointed the battery did not work but satisfied with how the seller treated me after the sale and refund.

Holds up to the constant shifting of my wife's 140.6-mile Ironman Triathlons.

I bought this battery so that I can have a spare in case my primary gives out. Not much to tell other than it arrived exactly as described and works perfect. It has a somewhat matte finish. My primary battery is much smoother. It makes no difference to me. My only gripe is the cost. That aside, I would recommend it to any one.

Great, just what the bike needed

The Battery arrived and I fully charged it. I placed it on my bike and checked to see that it was working. 10 days later I go to ride and the battery is fully discharged. I give it a quick charge for 30 minutes and got it up to 50% charged. After a 3-hour ride, 40 miles the battery was fully discharged again. My previous battery would work for an entire month, and I would be able to get about 1200 miles before I needed to charge it. I need this item to be replaced with a brand-new battery that will last and function like the original battery. Not another replacement battery that has been sitting on a shelf for the last 15 years.